Question

y=x+2 domain: 0,1,2, and 3

Answer 1

Assuming you are told to find the range of this function:
$f(0)=0+2=2$
$f(1)=1+2=3$
$f(2)=2+2=4$
$f(3)=3+2=5$

So the range of function is {2, 3, 4, 5}.